721961309484 has 36 divisors (see below), whose sum is σ = 1837205806800. Its totient is φ = 239038642080.

The previous prime is 721961309471. The next prime is 721961309497. The reversal of 721961309484 is 484903169127.

721961309484 is a `hidden beast` number, since 7 + 2 + 19 + 613 + 0 + 9 + 4 + 8 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (721961309471) and next prime (721961309497).

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 721961309484.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67291552 + ... + 67302279.

Almost surely, 2^721961309484 is an apocalyptic number.

It is an amenable number.

721961309484 is an abundant number, since it is smaller than the sum of its proper divisors (1115244497316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721961309484 is a wasteful number, since it uses less digits than its factorization.

721961309484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134593990 (or 134593985 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 721961309484 in words is "seven hundred twenty-one billion, nine hundred sixty-one million, three hundred nine thousand, four hundred eighty-four".